秦岭穆家庄铜矿地球化学特征

位于秦岭造山带东部柞山热水盆地中南部的穆家庄铜矿床由 7个矿体组成 ,赋矿地层为中泥盆统一套浅变质的具韵律特征的复理石沉积建造 ,矿床产出与地层层位、区域构造和NWW向断裂破碎带密切相关。矿石及其围岩的矿物组成、结构构造、化学成分、流体包裹体和氧、碳同位素地球化学研究表明 ,成矿温度为15 0～ 330℃ ,盐度 5 .8～ 2 3% ,矿石及围岩均以富SiO2 、TFe、Cu、Mn、Ba、Ca、Zn、Pb、Mg、As、Sb、S、C、B、K等元素为特征 ,成矿元素Cu、Zn、Pb等主要来源于前泥盆纪地层 ,成矿流体的O、C主要来自海水 ,铜矿床成因属于弱改造的海底喷流沉积型

GEOCHEMICAL CHARACTERISTICS OF MUJIAZHUANG COPPER DEPOSIT,QINLING,SHAANXI PROVINCE

Located in the central part of the Zhashui Shanyang hydrothermal basin in eastern Qinling tectonic belt, the Mujiazhuang copper deposit consists of 7 orebodies along the strata. The country rocks of the copper deposit are a set of shallow marine detritus series strata which underwent slight metamorphism. Ore and country rock mineral assemblage, texture and structure, chemical composition, liquid inclusions and oxygen carbon isotopic geochemical characteristics indicate that the deposit was formed at the temperature of 150 330℃ with salinity of 5.8 23%, and that the ore and country rocks are enriched in SiO 2, TFe, Cu, Mn, Ba, Ca, Zn, Pb, Mg, As, Sb, S, C, B and K. It is suggested that the ore forming metals Cu, Zn and Pb mainly came from pre Devonian strata. Both O and C in the ore are of cognate origin, mainly from sea water. Therefore, the ore was produced in submarine sedimentary exhalation process.